In his private letters, Gen. Sherman says he knew Hooker very well from their long association in the antebellum army, until Sherman's resignation in the 1850s. He could not see him handling the Army of Potomac well, and so was probably not surprised by the results of the Chancellorsville campaign...
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On July 29, 1864, Sherman wrote of his personal opinion of Hooker succinctly...
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In his memoir, Gen. Sherman explains that Gen. Thomas, Hooker's immediate commander in the Atlanta campaign, complained that Hooker was becoming too inclined to "switch off" and do his own thing... then inclined to magnify the effect. Gen. Sherman says after Kennesaw he was forced to confront Hooker on this bad habit, but thinks he was too lenient, as Hooker responded with a sulkiness rather than discipline and propriety...
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Sherman says that he had known Hooker personally and professionally since 1836, and had served actively with him in the antebellum years. Says he was personally satisfied with his services rendered at Chattanooga, and the Atlanta campaign up to the above confrontation at the Kulp House near Kennesaw, when his new sulkiness combined with more breaches of strict military propriety that Sherman had already reproved him for. After Gen. McPherson's death, when passed over for his army command, Hooker's request of relief from command of the 20th Corps was quickly accepted... Though Sherman seems clear that he did not consider Hooker completely incompetent otherwise, and seems inclined to point out his good service rendered in the Battle of Peach Tree Creek particularly.
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After the Atlanta campaign, during the March to the Sea, the 20th Corps and 14th Corps formed a left wing to Sherman's movements, and the commander of the 20th Corps, Gen. Slocum since Hooker's relief, consequently commanded essentially a separate army, designated eventually the "Army of Georgia." Had Hooker shown some contrition to Sherman after the Kennesaw, perhaps he would have had a opportunity he desired to command an army again before the close of the war.
Hooker was eventually promoted to major general in the regular army upon retirement in October, 1868.